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| RADIANT FACET DIAGRAM | SQUARE RADIANT FACET DIAGRAM | RADIANT DIAMOND |
CUT GRADE DETERMINANTS FOR RADIANT CUT DIAMONDS
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CUT CLASSES
|
1A |
1B |
2A |
2B |
3A |
3B |
4A |
4B |
| Ideal |
Premium |
International fine trade |
US domestic average |
below average |
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| Table % |
60-65.5% |
59-68% |
58-69.5% |
57-72% |
56-74% |
53-76.% |
50-78.% |
>78% <50% |
| Crown Height % |
12-15.% |
11-16% | 10-16.5% |
9-17.2% | 8-18.0% |
7-19.5% | 6-20.5% | <6% >20.5% |
| Girdle thickness Word descriptions and percentages. |
V. Thin to Sl. Thick (0.4%-4.5%) or Thin to Thick (1%-5.5%) |
V.Thin to Thick(0.4%-5.5%) |
Very Thin to Very Thick (0.4% to 7.0%) |
Extremely thin to Extremely thick (0.0% to >7.0%) |
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| Total Depth % |
60-65% |
58-69% | 57-74% |
56-78% |
53-80% |
>80% <53% |
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| Polish/Symmetry Not a primary determining factor. |
Excellent to Good |
Good or Fair | Poor to Fair | |||||
| Square range Length : Width ratios Preferences only |
0.95-1.05 |
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| Rectangular range Length : Width ratios Preferences Only |
1.5-1.75 |
1.49-1.26 1.76-1.99 |
> Class 3 < Class 3 |
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